Steam power plant

ABSTRACT

The invention relates to a steam power plant which consists essentially of a steam generator ( 1 ), a turbo group comprising a condensing steam turbine ( 2 ) and generator ( 3 ), a water-cooled condenser ( 4 ) and a bled-steam-heated preheating system. In said steam power plant all components, including the fuel storage area ( 6 ), are situated at ground level and in the open air. The turbo group ( 2, 3 ) and the condenser ( 4 ), the preheating system with associated pumps and the transformers ( 7 ) are arranged such that a gantry crane is able to pass over them. The steam generator ( 1 ), flue gas cleaning system ( 16 ) and the chimney ( 17 ) are positioned in a row along a common flue gas axis ( 18 ) and the turbo group ( 2, 3 ) arranged in the immediate vicinity and parallel thereto. As seen from the main wind direction ( 9 ), the coal storage area ( 6 ) is positioned downwind from the turbo group ( 2, 3 ) and the steam generator ( 1 ).

FIELD OF TECHNOLOGY

The invention relates to a steam power plant, comprising essentially asteam generator, a turbo group with condensation steam turbine andgenerator, a water-cooled condenser, and a bleeder steam-heatedpre-heater system.

STATE OF THE ART

Such power plants are usually produced according to customerspecification and site requirements and therefore involve lengthyproject development, planning, and construction times and, as a result,high costs. Especially the construction time in these customerspecification-oriented power plants is influenced by the fact that avery detailed advance engineering is not possible, and essential aspectsof the work, for example the construction portion, which should beprocessed as early as possible, only can be started with a delay.

It is known per se to reduce the construction time by building powerplants using open air construction. But this type of construction againcauses a number of disadvantages with respect to their operation as wellas maintenance and repair. In this connection, DE 1426918 A1 disclosesthe concept of a steam power plant designed to be built in a shorterconstruction time and reduced investment costs, and which is supposed tohereby reduce said disadvantages. This concept is essentially based onthe fact that the turbo group is arranged in a lane between the steamgenerators and a portal crane is mounted on the steam generators inorder to facilitate both their assembly as well as the assembly of theturbo group. In addition, the principle of multipurpose use has beenrealized in such a way that the support frames of the steam generator orthe coal bunker are at the same time equipped for receiving secondaryinstallations, and the portal crane is able to serve both steamgenerator and power generator parts. The steam power plant constructedaccording to this concept is very compact and is brought together withina tight outline. The main emphasis of this solution is the reduction ofconstruction time and expenditures. The price for the advantages of asmall space requirement and multipurpose use of support frames is avertical arrangement of numerous installation parts. But it isespecially this vertical arrangement of numerous installation partswhose assembly is facilitated with the highly positioned portal craneduring the construction phase, that excludes a use of the crane fornecessary repair and maintenance purposes of the same installation partsin the operation phase. After the construction phase, the crane 's useis essentially limited to the turbo group, since it is unable to accessthe installation parts of all intermediate planes.

DESCRIPTION OF THE INVENTION

The invention is designed to remedy this problem. Starting with thementioned state of the art, the invention is based on the objective ofcreating a steam power plant characterized by very friendly maintenanceand repair friendliness. In addition, a steam power plant should becreated that achieves substantial standardization and can be built at avariety of possible sites.

The invention therefore is based on a steam power plant comprisingessentially a steam generator, a turbo group with condensation steamturbine and generator, a water-cooled condenser, and a bleedersteam-heated pre-heater system and a portal crane and is characterizedin that all components of the steam power plant, including the fuelstorage site, are located at ground-level and placed in an open airarrangement and the portal crane swings over an area in which the turbogroup with the condenser, pre-heater system and associated pumps as wellas the transformers are arranged.

If the steam generator, flue gas cleaning system and chimney are locatedin series within a common flue gas axis, it is useful that the turbogroup is located immediately adjacent and parallel to them.

If the fuel storage site is a coal heap, it would be suitable to locateit down-wind—seen in the main wind direction—behind the turbo group andsteam generator.

The advantage of all these measures is in particular that thestandardization of the installation engineering and of the componentsreduces the investment costs to a remarkable degree. The outline of thepower plant is formed by a clearly defined rectangle. This makes itpossible to expand the installation at any time by simply placing suchrectangles next to each other. The previously common, very extensiveproject engineering is no longer required hereby. The power plant blocksthat will be located next to each other are identical; only the accessroads must be minimally adapted. Another advantage is the consistentlyrealized open air placement. This makes it possible to forego theexpensive and time-consuming construction of buildings, such as boilerand machine house. The measure of arranging the turbo group with thecondenser, pre-heater system and associated pumps, as well as with atleast the own-demand transformers in such a way that a portal crane canswing over them also defines a rectangular cross-section for thesecomponents. This makes it possible to arrange the installation parts inthe tightest space directly next to each other without negativelyaffecting operation and maintenance. Maintenance and repair work can beperformed with the crane. This arrangement also enables the shortestpossible connections between the various installation parts, which againhas a positive effect on assembly and maintenance.

The sensible measure of locating the coal heap down-wind behind theturbo group and the steam generator in no way has an adverse effect onthe requirement of a rectangular cross-section of the installation andcan be performed independently from the wind direction. This makes itpossible to avoid coal dust emissions in the area of the technicalinstallations and administrative operations. The desired rectangularcross-section in any case can also be realized in relation to thegeographical location of the body of water necessary for coolingpurposes. The respective situation plan in each case naturally takesinto account this water location, whereby the emphasis here is also onthe shortest possible connection paths.

A flatbed feeder located at ground level is provided for depositing theunground coal onto the inclined belt to the coal breaker. This meansthat the large and deep, concrete-lined, subterranean feeder pit thatusually was required up to now is no longer necessary, which greatlyreduces civil engineering work.

The steam generator is preferably supplied with roughly ground coal fromcoal silos. It is hereby reasonable that the coal silos associated withthe steam generator are connected with the coal breaker located upstreamfrom the steam generator by an at least approximately horizontallyextending conveyor device with subsequent vertical conveyor device. Theground-level placement of the horizontally extending conveyor devicemakes it possible to eliminate complicated steel frames.

The steam turbine has an axial exit so that the steam condenser islocated in the axial extension of the steam turbine. This solution,which is advantageous because of the almost ground-level placement ofthe turbo group, as well as the open air placement, allows unlimitedaccess to the condenser. If condenser pipes must be replaced, this doesno longer require removal facade elements from a building, as was thecase in the past. In addition, the portal crane swinging over thecondenser can be used for such maintenance procedures.

It is advantageous if all pre-heaters are designed for the same pressureon their water side, have essentially the same dimensions, and arelocated adjacent to the turbo group. This measure guarantees theshortest connections both on the water and steam side and also allowsuse of the portal crane for maintenance work.

Starting with the recognition that because of lacking advance planningand customization to client specifications the construction time for apower plant is extraordinarily long today, the invention, ascharacterized in the claims, is based on the task of achievingsubstantial standardization and creating a power plant that can be builtat a variety of possible sites.

BRIEF DESCRIPTION OF DRAWING

The drawing shows an exemplary embodiment of the invention in the formof a single-shaft, axial-flow turbo group with coal as the primary fuel.Only elements essential to understanding the invention are shown. Whatis not shown of the installation is, for example, the numerous linesbetween the machines and equipment as well as most of the terminationand control fittings, etc. The flow direction of the various workingmedia is shown by the arrows. In the drawing:

FIG. 1 shows the principle layout of the installation;

FIG. 2 shows a multi-installation;

FIG. 3 shows a top view of the turbo group and adjacent area;

FIG. 4 shows the transport path of the coal from the coal heap to thesteam generator;

FIG. 5 shows the heat diagrammatic of the installation;

FIG. 6 shows the cooling water removal;

FIG. 7 shows the liquid fuel diagrammatic;

FIG. 8 shows the principle layout of the installation for a differentwind direction;

FIG. 9 shows the principle layout of the installation with a differentlocation of the body of water.

WAY OF EXECUTING THE INVENTION

According to FIG. 1, an installation module containing all of the powerplant components carries the reference number 200. Such a module couldcomprise, for example, a 150 MW installation and is preferably built inan exclusively industrial zone in order to protect neighbors fromemissions, such as dust, noise, and truck traffic. Reference number 6indicates the fuel storage site. In this case, this is an open coalstorage having a rectangular outline. In the shown example, the coalheap is located directly adjacent to a river 20, which means that thecoal can be delivered by ship. Naturally, it my also be delivered bytrain or trucks over access roads 36. If the installation is near a coalmine, transport via conveyor belts would also be possible.

Based on this coal heap 6, the basic orientation of the power plantelements is then determined by the main wind directions 9.

The coal is first piled with a shovel dozer 49—that also can be used forexcavation work during the construction phase—from the heap 6 onto aflatbed feeder 10 (FIG. 4). From there, the piled up transportedmaterial 41 reaches the inclined belt 11 leading to the coal breaker 20.As already mentioned initially, the feeder 10 eliminates the need for aconcrete-lined pit in which the coal is guided via funnels onto aconveyor belt. Since the feeder 10 is located at ground-level on afoundation plate, this new measure, in comparison to the pit solution,also reduces the length of the inclined belt 11 that must convey thematerial to the inlet of the breaker building 12 which is usuallylocated at a height of about 15 to 20 meters.

From the coal breaker, the transported material is first transported viaa horizontal conveyor device 14 and then via a vertical conveyor device15 to a horizontal conveyor 43 from which it is filled into the coalsilos 13. This solution has several advantages over the previouslycommon inclined belt conveyance to the silos. Since the charging systemof conventional boiler silos is usually located at a height of 50meters, an inclined belt conveyance with the usual 14° to 15° inclinemust be almost 200 meters long. The present new measure makes itpossible to reduce this length drastically, so that the coal breaker 20can be located very close to the boiler. Furthermore, the horizontalconveyor device 14 can be built at ground level on simple concrete ties.Extensive steel constructions, such as in the case of inclined beltconveyance, which also require a high crane capacity during assembly,are no longer necessary. It should be understood that the access to ahorizontal conveyor belt extending at ground level is also simplifiedbecause of the elimination of operating and walking ways.

This type of construction—first horizontal, then vertical—also allowsthe principal standardization of the subsequent vertical conveyor device15. This is an encased bucket conveyor with a simple carrying structurethat is also positioned at ground level and is preferably connected withthe boiler structure in order to take up horizontal loads. Because ofall of this, only the length of the horizontal conveyor device 14 mustbe adapted to different situations in each case, i.e. the distancebetween coal heap and boiler.

The steam generator 1 works with atmospheric fluidized bed combustion.Hereby roughly broken coal with a particle size of about 6 mm can beused. The advantage in this is that in addition to the coal breaker 20no additional coal mill is required. The steam generator is held in asteel frame; an exterior encasing or roof is no longer necessary.

FIG. 1 shows that a tank 24 for liquid fuel is located directly beforethe steam generator. This liquid fuel is necessary for starting up thesteam generator and for the stabilizing fire. The location of this tankhas been chosen with respect to short conveyance distances. The tankitself is located in a concrete collecting basin. The pumps 25 for thestart-up fuel are located immediately next to the tank 24 on pedestalsprojecting from the concrete foundation plate. This foundation plate ishereby constructed as a collecting basin for the pump area.

The tank can be filled from the road 36 by tanker trucks. It was foundthat an advantageous solution is to use the pumps 25 for the start-upfuel both for charging the burners and for filling the tank. FIG. 7shows how this can be realized. To fill the tank, the pump 25 withdrawsfuel from the tanker truck via an appropriately set three-way element 47and transports it via another appropriately set three-way element 46through filling line 48 into the container. To start up the steamgenerator and for the stabilization fire, the pump 25 again transportsthe fuel from the tank 24 to the burners 45 of the boiler 1 by way ofthree-way elements 47 and 46 that are again set appropriately.

Since the steam generator 1 functions with atmospheric fluidized bedcombustion, no desulfuration of the flue gases is necessary.Accordingly, the boiler is followed immediately by the flue gas cleaningsystem 16 that consists essentially of an electrostatic separator or afibrous filter. The cleaned waste gases are released through the chimney17 into the atmosphere. FIG. 1 shows that the steam generator 1, theflue gas cleaning system 16, and the chimney 17 are located in thelongitudinal axis of the boiler in a so-called flue gas axis 18.

The machine axis 33 then extends parallel to this flue gas axis 18. Theturbo group 2,3 and the condenser 4, as well as the transformers 7 andpreferably the open air switching installation 34 are arranged in thisaxis. Here the difference to other installations in which the turbogroup is usually located at the frontal face of the steam generator 1can be seen.

Module 200 further shows the road system 36 that permits access to theinstallation, a workshop 31, and a switching installation system 32, aswell as the cooling tower system 35, the added water 19 leading there,and the water reprocessing system 30. To keep the piping short, aplacement of the cooling tower system as close as possible to thecondenser 4 is desired. An above-ground arrangement has been selectedfor these pipes so that the construction work for the installationconstruction is not adversely affected. For the alignment of the coolingcells with each other, both the function of the predominant winddirection as well as the distance to the turbine and boiler wasconsidered; the objective hereby is not to adversely affect theventilation of the cooling towers.

The added water is removed without the previously common, extensiveintake mechanisms. FIG. 6 shows that the added water is transported inthe simplest manner via a dirty water pump 22. In the present example,this pump is located in a concrete pipe 21 that can be submerged in thebody of water 20. The concrete pipe preferably consists of individual,stacked concrete rings, of which at least one is provided with inletopenings 44. The pipe 21 and pump 22 stand on a thin concrete plateplaced into the river bottom. The water removal unit can be accessed viaa walkway 37. The water pipes 19 extend near the bottom and aresupported on ties 38.

As much as possible, mechanical and electrical accessories areprefabricated and pre-assembled and are transported to the installationin transport containers. For assembly, the containers are placed by acrane on simple concrete ties. This reduces both the customizationengineering and the assembly time. The same applies to the entirelubrication and control oil system, including oil tank and pumps, thatcan be delivered pre-assembled and are placed immediately next to theturbo group into a concrete collecting basin.

For the same wind direction and same river course as in FIG. 1, FIG. 2shows an arrangement of three modules 200. The only difference to theinstallation according to FIG. 1 is the continuous roads 36. This showsthat an installation can be expanded at any time without adverselyaffecting the operation of the already existing modules. If it is evenknown before a power plant installation is built, that it willeventually consist of several modules, naturally a common coal heap andcommon cooling water removal will be considered.

FIG. 3 shows those elements over which the portal crane 8 swingsaccording to the present invention. At the right edge of theillustration, the flue gas axis 18 with the elements pumps 25 forstart-up fuel, coal silos 13, steam generator 1, and flue gas cleaningsystem 16 are shown. The fact that the installation does not need anybuildings and the arrangement of the pre-heaters on the side facing awayfrom the boiler—described below—now makes it possible that the actualturbine 2 can be located directly adjacent to the boiler 1, thusenabling extraordinarily short connecting lines not shown in thisfigure. This particularly holds true for the fresh steam line.

The crane tracks 39 of the portal crane 8 are supported on both sides onconcrete columns 40, so that the passage of steam lines, water lines,and cable channels is not hindered. Their length is such that theyinclude the own-demand transformer 7 and the feed pump block 26, both ofwhich are arranged in the machine axis 33. The crane width has beenselected so that the crane (8) is also able to serve the pre-heatersystem 5 and the switching system building 32, both of which areconstructed in container construction. This shows that this crane (8) isalso required for the initial construction of the installation, so thatno mobile lifting systems are necessary. Accordingly, the loadingcapacity of the crane is designed for the heaviest turbine parts thatmust be moved during assembly. This does not apply to the generator 3that is preferably brought into its operation position via skid rails.

The advantage of the ground-level placement of all mentioned elementsand their operation via portal crane cannot be underestimated.Especially in those market segments that permit an open air arrangementof the installation, among others for climatic reasons, often mobilecranes with an adequate design and loading capacity are not available.This is especially true if the completed installation deviates from theplan, in which case this must be immediately remedied.

Where the actual machine is concerned, in this case comprising a steamturbine with a high-pressure part 2A, an intermediate pressure part 2B,and a low pressure part 2C, as well as a generator 3, the term “groundlevel” must be qualified. In fact, this is an almost ground-levelplacement, whereby it should be understood that it is not a constructionin which the machine is placed onto a foundation table that itself issupported by steel or concrete columns. This almost ground-levelplacement of the machine is made possible because the waste steam of thelow-pressure turbine 2C is axially oriented, and the condenser neck ofthe condenser 4 that is located on the same level is connected viaflange with the waste steam. As a result of this construction, themachine axis 33 is only 5.5 meters above the ground, eliminating theneed for the usual operating platform around the machine and anyintermediate floors. Platforms with corresponding staircases are onlyprovided at places where an access for operating personnel andmaintenance purposes is absolutely necessary.

The turbo group 2, 3 with condenser 4 is supported by a simple,monolithic concrete foundation plate, whereby column plates projectingfrom the foundation support the bearings and cases. The above mentionedrequired platforms are located at a height of about 4.5 m above theground. The oil lines are placed on them.

Because of the open air arrangement, the turbine cases are equipped withweather-resistant covers with correspondingly designed ventilationopenings. These covers are also supported on the mentioned platforms.

All turbine housings are provided with a horizontal separation level,and at least all steam bleeder lines (110 in FIG. 5) are arranged on therespectively lower housing half. This means that these lines need not beremoved when the top housing halves are covered as required duringmaintenance work on the blades or rotor. The low placement of the linesabove the ground that results from this also has the advantage that thesupports for the pipes can be constructed simply and can be simplyinstalled even during the initial assembly. Access during any necessarywelding work, tests, and insulations is also simplified. Theclose-to-the-ground placement of the bleeder steam lines now suggeststhat the feed water pre-heaters 5 are arranged accordingly. They arelocated immediately adjacent to the turbine. In the example of a 150 MWinstallation, the pre-heater installation consists of five deviceslocated next to each other. It should be understood that they could bepartially located on top of each other—without deviating from theunderlying concept of ground-level placement—for example 3 pre-heaterson the ground, and 2 pre-heaters above them. The decisive factor here isthat they can be operated from the portal crane 8. The selectedarrangement next to the turbine 2 results in short bleeder steam lines.The fact that they are not located on the boiler side but on theopposite side has the advantage that the bleeder steam lines and thesteam lines leading to the steam generator are separated from eachother. The close-to-the-ground placement of the pre-heaters also allowssimple supports in the form of concrete pedestals that also carry thefeed water lines and bleeder steam lines.

All pre-heaters 5 essentially have the same dimensions and are designedon the water side for the same pressure. This already indicates that thewater-steam cycle is designed so that it does not need a feed watertank/degasser. This usually large and heavy device is usually arrangedat a height of about 15 meters and requires the corresponding expensivesupports. By eliminating this tank and the corresponding line placement,a significant reduction in investments costs and assembly time can berealized.

The water-steam cycle is shown in a simplified manner in the heatdiagrammatic in FIG. 5 and shall be briefly described below. The feedwater enters the economizer 101 of the steam generator 1 at the usualconditions (170 bar, about 250° C.) and from there reaches the steamcollecting drum 103. In the natural cycle, the water is passed throughthe evaporator 102 and then, as saturated steam, back into the drum. Inthe multi-part superheater 104 (not shown), it is heated to its finaltemperature of 540° C. and conducted via the fresh steam line 105 intothe high pressure part 2A of the steam turbine. There, the steam isexpanded to a pressure of about 40 bar while releasing power in theprocess. The steam is returned via the cold intermediate superheaterline 106 into the boiler, is reheated in the intermediate superheaterthere again to 540° C., and is conducted via the hot intermediatesuperheater line 108 into the intermediate pressure part 2B of the steamturbine. After repeated partial expansion, the steam passes from theintermediate pressure part into the low pressure part 2C, in which it isexpanded to condenser pressure. In the water-cooled condenser 4, thesteam is condensed, the condensate collects in the hot well (not shown),from where it is transported by the condensate pump 111 into thepre-heater system. To this extent, such installations are known.

To simplify the pre-heater system, the following concept has now beenchosen. The feed pump 26 is constructed in two stages. On the waterside, a primer pump 27 is arranged upstream from the pre-heaters 5, anda main pump 28 is arranged downstream from the pre-heaters. Thetwo-stage feed pump is provided with a common drive 29. In thepre-heaters, the feed water is heated to the boiler inlet temperaturewith bleeder steam removed via the stages of turbines 2A-2C thatcorrespond to bleeder lines 110. The two-stage execution of the feedpump has the advantage that all pre-heaters can be designed on theirwater-side for the same low pressure and therefore can be manufacturedin a cost-efficient manner. The final pressure of the primer pump 27 isselected as a function of the pressure loss within the pre-heater trainand the permissible inlet pressure of the main pump 29.

As a special feature, a compensation tank 23 for cold condensate isprovided in the pre-heater train between the condensate pump 111 andfeed pump 27. This tank can function with a steam or inert gas pressurecushion and is used to supply the feed pump 27. This tank is usedespecially in non-stationary operating conditions.

The heat diagrammatic of FIG. 5 also shows the generator 3. Thisgenerator 3 is air-cooled, whereby the cooler box 112 is connected witha flange directly to the generator. A special feature here is that forthe recooling of the cooling air circulating in the closed circuitnon-desalinated cooling water is removed from the main cooling circuit51. In contrast to previous air/water coolers whose cooling elementswere in most cases constructed of copper or nickel, stainless steel isused for this purpose. Nevertheless, the cooling water system is stillmore cost-efficient, since the use of main cooling water for cooling thegenerator makes it possible to construct the intermediate cooling systemneeded for other purposes, which works with reprocessed water, smallerand therefore cheaper.

The fact that the generator axis also is located at a height of about5.5 meters above ground makes it possible to arrange the generatorswitches and exciter equipment (not shown) below the generator. They maybe located on a simple concrete plate. The generator output lines aretherefore located at the underside of the generator and extend serially,therefore resulting in the shortest possible line lengths. This solutionprevents complicated support constructions, such as are known from thelateral exit of the output lines above the generator.

FIGS. 1 and 3 show the placement of the transformers 7 immediately nearthe generator 4, which results in short bus bars 50. The own-demandtransformer and block transformers are separated from each other by afire protection wall. The installations has been designed so that atleast the own-demand transformer can be operated from the portal crane.

The switching system 34 can be designed as a gas-insulated high voltagemodule, which in the one hand significantly reduces the amount of spacerequired, and on the other hand makes it possible that the switchingsystem can be constructed very closely to the transformer system. Theswitching systems and attendance room are also constructed ascontainers. The modules are placed as prefabricated units with theportal crane onto a ground-level foundation plate with a surroundingpedestal. The space created in this way is used as a cable cellar.

FIGS. 8 and 9 show the selected principal layout for another winddirection and, respectively, for another course of the body of water.According to specification, the coal heap 6 in both arrangements islocated down-wind. The figures show the great advantage of the coaltransport concept. Only the length and course of the horizontal conveyor14 must be adapted to the new situation. The installation in FIG. 9differs from that in FIG. 8 by the different course of the river 20.Because of a differently designed water removal, this only results in adifferent geometry of the module 200.

List of Reference Numbers

1 steam generator

2 condensation steam turbine

2A high pressure part

2B intermediate pressure part

2C low pressure part

3 generator

4 condenser

5 pre-heater system

6 fuel storage site

7 transformers

8 portal crane

9 main wind direction

10 flatbed feeder

11 inclined belt

12 coal breaker

13 coal silo

14 horizontal conveyor device

15 vertical conveyor device

16 flue gas cleaning system

17 chimney

18 flue gas axis

19 added water

20 body of water

21 concrete pipes

22 dirty water pump

23 cold condensate compensation pump

24 liquid fuel tank

25 pump for start-up fuel

26 feed pump

27 primer pump

28 main pump

29 feed pump drive

30 water reprocessing system

31 workshop

32 switching system building

33 machine axis

34 switching system

35 cooling tower

36 access road

37 walkway

38 tie

39 crane track

40 concrete columns

41 transported material

43 horizontal conveyor

44 inlet openings in 21

45 burner in 1

46 three-way element

47 three-way element

48 filling line

49 bucket loader

50 bus bar

51 main cooling water

101 economizer

102 evaporator

103 steam collecting drum

104 superheater

105 fresh steam line

106 cold intermediate superheater line

107 intermediate superheater

108 hot intermediate superheater line

110 bleeder line

111 condensate pump

112 generator cooling module

200 module

What is claimed is:
 1. A steam power plant with close-to-the-groundplacement, comprising essentially a steam generator, a turbo group withcondensation steam turbine and generator, a water-cooled condenser, anda bleeder steam-heated pre-heater system and a portal crane swinging atleast over the turbo group wherein all components of the steam powerplant, including a fuel storage site, are located at ground-level andplaced in an open air arrangement, and the portal crane swings over anarea in which the turbo group with the condenser, pre-heater system andassociated pumps as well as the transformers are arranged.
 2. A steampower plant as claimed in claim 1, wherein said all components of thesteam power plant, including the fuel storage site, form a module with arectangular outline.
 3. A steam power plant as claimed in claim 2,wherein a plurality of said modules are located next to each other.
 4. Asteam power plant as claimed in claim 1, wherein the steam generator issupplied from at least one coal silo with coal, whereby the at least onecoal silo is connected with the fuel storage site via a ground-levelfeeder, an inclined belt, a coal breaker, and an at least approximatelyhorizontally extending conveyor device with adjoining vertical conveyordevice.
 5. A steam power plant as claimed in claim 1, wherein the steamgenerator, a flue gas cleaning system and a chimney are arrangedserially in a common flue gas axis, and that the turbo group is herebyarranged immediately near them and parallel to them.
 6. A steam powerplant as claimed in claim 1, wherein a low pressure steam turbine of theturbo group has an axial exit, and the steam condenser is located inaxial extension of the steam turbine, whereby bearings and housing aresupported directly on concrete pedestals located on a ground-levelfoundation.
 7. A steam power plant as claimed in claim 1, wherein allpre-heaters are designed on the water side for the same pressure, haveessentially the same dimensions, and are arranged so as to adjoin theturbo group.
 8. A steam power plant as claimed in claim 7, whereinupstream from the pre-heater system a compensation tank loaded with coldcondensate is provided.
 9. A steam power plant as claimed in claim 7,wherein a feed pump is constructed in two stages, whereby on the waterside a primer pump is arranged upstream from the pre-heaters, and a mainpump is arranged downstream from the pre-heaters.
 10. A steam powerplant as claimed in claim 9, wherein the two-stage feed pump has acommon drive.
 11. A steam power plant as claimed in claim 1, wherein thegenerator is air-cooled, and that for the recooling of the cooling aircirculating in the closed circuit non-desalinated main cooling water isremoved from the condenser cooling cycle.
 12. A steam power plant asclaimed in claim 1, wherein the added water is transported by adirty-water pump provided with inlet openings and located in a concretepipe submerged in a body of water.
 13. A steam power plant as claimed inclaim 1, wherein liquid fuel that is stored in a tank locatedimmediately adjacent to the steam generator is used for starting up thesteam generator and for the stabilizing fire, whereby pumps for thestart-up fuel are used both for feeding burners as well as for fillingthe tank.